"exotic metal alloys. For World War II aircraft with sideways-retracting main gear units, carefully set-up ""pintle angles"" for such axes of rotation during retraction and extension allowed the maingear struts to be raked forward while fully extended for touchdown and better ground handling, while permitting retraction into rearwards-angled landing gear wells in their wings to usually clear the forward wing spar for stowing while in flight. Pintle A pintle is a pin or bolt, usually inserted into a gudgeon, which is used as part of a pivot or hinge. Other applications include pintle and lunette ring for towing, and pintle"
"Hinge A hinge is a mechanical bearing that connects two solid objects, typically allowing only a limited angle of rotation between them. Two objects connected by an ideal hinge rotate relative to each other about a fixed axis of rotation: all other translations or rotations being prevented, and thus a hinge has one degree of freedom. Hinges may be made of flexible material or of moving components. In biology, many joints function as hinges like the elbow joint. There are many types of door hinges. The main types include: Other types include: Since at least medieval times there have been"
"Pin A pin is a device used for fastening objects or material together, and can have three sorts of body: a shaft of a rigid inflexible material meant to be inserted in a slot, groove, or hole (as with pivots, hinges, and jigs); a shaft connected to a head and ending in a sharp tip meant to pierce one or more pieces of soft materials like cloth or paper (the straight or push pin); a single strip of a rigid but flexible material (e.g. a wire) whose length has been folded into parallel prongs in such fashion that the middle"
"fixed and moving parts. The hinge has a pin ""pintle"" and can be both external and internal. The most common type consists of 3 parts. One part on the body of the cubicle, one part on the door and the third part is the pintle. In transportation, a ""pintle hitch"" is a type of tow hitch that uses a tow ring configuration to secure to a hook or a ball combination for the purpose of towing an unpowered vehicle. As a weapon mount a pintle-mount is used with machine guns as the mounting hardware that mates the machine gun to"
"fitting is a gudgeon turning on a pintail the upper two fittings are a pair of gudgeons each with a pin joining them with split pin/washer to stop them coming out. In navigations locks, the upper pivot point for a miter gate is referred to as the gudgeon, and carries horizontal loads caused by a gate leaf hanging with no water load. The lower pivot, which carries the weight of the leaf, is referred to as the pintle. Gudgeon A gudgeon is a socket-like, cylindrical (i.e., ""female"") fitting attached to one component to enable a pivoting or hinging connection to"
"Drift pin In metalworking, a drift pin, drift pin punch, slave pin, simply drift, or even pokey bit is the name for a tool used for enlarging holes, or aligning holes prior to bolting or riveting metal parts together. A drift pin is not used as a punch in the traditional sense of the term. A drift is constructed as a tapered rod, with the hammer acting on the large end of the taper. The tapered end of a drift punch is placed into the semi-aligned bolt holes of two separate components, and then driven into the hole. As it"
"piston can change as the rod moves up and down and rotates around the crankshaft. Connecting rods, especially in racing engines, may be called ""billet"" rods, if they are machined out of a solid billet of metal, rather than being cast or forged. The small end attaches to the piston pin, gudgeon pin or wrist pin, which is currently most often press fit into the connecting rod but can swivel in the piston, a ""floating wrist pin"" design. The big end connects to the crankpin (bearing journal) on the crank throw, in most engines running on replaceable bearing shells accessible"
"guns and some older revolver designs. They are also known as hinge-action, break-open, break-barrel, break-top, or (on old revolvers) top-break actions. A substantial hinge pin joins the two parts of the rifle or shotgun; the stock with its firing mechanism and the fore-piece and barrel, which hold the round to be fired. In some cases the hinging pin may be easily removable, allowing the two portions of the weapon to be compactly and safely stored. In other cases the hinge will consist of a hook over a pin; releasing an auxiliary latch will allow sufficient travel to allow the hinge"
"Kingpin (automotive part) The kingpin, also king-pin and king pin, is the main pivot in the steering mechanism of a car or other vehicle. The term is also used to refer to part of a fifth wheel coupling apparatus. Originally, with the 'turntable' steering of horse-drawn wagons, this was a single pin on which the moveable axle was pivoted beneath the wagon's frame. This located the axle from side to side, but the weight of the wagon was carried on a circular wooden ring turntable surrounding this. Similar centre pivot steering was used by steam traction engines, the kingpin being"
"Piton In climbing, a piton (; also called a pin or peg) is a metal spike (usually steel) that is driven into a crack or seam in the climbing surface with a climbing hammer, and which acts as an anchor to either protect the climber against the consequences of a fall or to assist progress in aid climbing. Pitons are equipped with an eye hole or a ring to which a carabiner is attached; the carabiner can then be directly or indirectly attached to a climbing rope. Pitons were the original form of protection and are still used where there"
"Gudgeon pin In internal combustion engines, the gudgeon pin (UK, wrist pin US) connects the piston to the connecting rod and provides a bearing for the connecting rod to pivot upon as the piston moves. In very early engine designs (including those driven by steam and also many very large stationary or marine engines), the gudgeon pin is located in a sliding crosshead that connects to the piston via a rod. A gudgeon is a pivot or journal. The origin of the word gudgeon is the Middle English word gojoun, which originated from the Middle French word goujon. Its first"
"Split pin A split pin, also known in the United States as a cotter pin or cotter key, is a metal fastener with two tines that are bent during installation, similar to a staple or rivet. Typically made of thick wire with a half-circular cross section, split pins come in multiple sizes and types. The British definition of ""cotter pin"" is equivalent to U.S. term ""cotter"". To avoid confusion the term split cotter is sometimes used for a split pin. A further use of the term ""cotter pin"" is the ""crank cotter pin"" used to lock bicycle pedal cranks to"
"R-clip An R-clip, also known as an R-pin, R-key, hairpin cotter pin, hairpin cotter, bridge pin, hitch pin or spring cotter pin, is a fastener made of a springy material, commonly hardened metal wire, resembling the shape of the letter ""R"". R-clips are commonly used to secure the ends of round shafts such as axles and clevis pins. The straight leg of the R-clip is pushed into a hole near one end of the shaft until the semicircular ""belly"" in the middle of the other, bent leg of the R-clip grips one side of the shaft resisting any force removing"
"Spring pin A spring pin (also called tension pin or roll pin) is a mechanical fastener that secures the position of two or more parts of a machine relative to each other. Spring pins have a body diameter which is larger than the hole diameter, and a chamfer on either one or both ends to facilitate starting the pin into the hole. The spring action of the pin allows it to compress as it assumes the diameter of the hole. The force exerted by the pin against the hole wall retains it in the hole, therefore a spring pin is"
"Belaying pin A belaying pin is a solid metal or wooden device used on traditionally rigged sailing vessels to secure lines of running rigging. Largely replaced on most modern vessels by cleats, they are still used, particularly on square rigged ships. A belaying pin is composed of a round handle and cylindrical shaft. The shaft is inserted into a hole in various strategically located wooden ""pinrails"" (lining the inside of the bulwarks, surrounding the base of masts, or free-standing, called fife rails) up to the base of the handle. A line is then led under and behind the base of"
"The kilt pin is a functional object that weighs down the edge of the apron of a kilt to keep it in place during movement. The ring and pin style penannular brooch, also known as the Celtic or Viking brooch, had the original purpose of being a fastener for clothing. Also native to Ireland, it's design was meant to mirror that of the torc. The first examples of this style of brooch date from circa 700CE. These items were first produced for the elite class out of precious metals, and over time the more simple item of the thistle brooch"
"and urethane formulas as well as durometers, which may affect turning, rebound and durability. A bolt called a ""kingpin"" holds these parts together and fits inside the bushings. Thus by tightening or loosening the kingpin nut, the trucks can be adjusted loosely for better turning and tighter for more stability (useful when landing tricks). Standard kingpin nut size is 3/8"" - 24tpi. The position of the hanger respect to the baseplate is also determined by the ""pivot"", a rod that slots into the corresponding seat in the baseplate. The pivot stops the hanger from rotating around the kingpin. The pivot"
"One American manufacturer, Eagle Lock Company, used letters exclusively for bitting codes. This is a type of key where the individual cuts are designed to engage chisel-pointed pins in high-security locking systems manufactured by Medeco and Emhart. These angled cuts are designed to lift each tumbler to a predetermined height to the shear line and to rotate them to a specific angle to engage a sidebar mechanism (Medeco) (this is also used in Schlage Primus) or to line up an interlocked pin to such a position to where it would allow the plug to rotate (Emhart). Bit (key) The bit"
"pin) is typically made out of steel or other types of metal. In conventional belts, the prong fits through the buckle to secure the material at a pre-set length. The prong is usually referred to as the tongue of the buckle in America, as in 'lock-tongued buckle'. Prong is only used when the tongue is permanently fixed in position. The bar served to hold the chape and prong to the frame. When prongs and chapes are removed from the buckle design, the buckle incorporated a movable bar relying on the tension of the adjusted belt to keep it in place."
"a lockbolt has annular grooves around the shaft of the bolt (pin). After placing the lockbolt in a hole, a threadless collar is forced at high pressures around the annular grooves, deforming the collar and permanently locking it into place around the grooves. Swaging is the generic term for setting a lockbolt and collar assembly. During the installation cycle of a lockbolt, the collar is deformed around the pin with locking grooves using special tooling. The tool engages onto the pintail, which is an extra portion of pin material protruding past the collar that the tool grabs and pulls. This"
"Cotter (pin) A cotter is a pin or wedge passing through a hole to fix parts tightly together. In British usage cotter pin has the same meaning, but in the U.S. it refers to a different fastener. Typical applications are in fixing a crank to its crankshaft, as in a bicycle, or a piston rod to a crosshead, as in a steam engine. Note: the angle of the wedge determines the position of the parts being held, therefore on a bicycle the pedal arms will only be at 180 degrees to each other if the angle of the cotter pin's"
"this is when used to secure a castellated nut. Split pins may be used in some applications as low-tech shear pins. Bibliography Split pin A split pin, also known in the United States as a cotter pin or cotter key, is a metal fastener with two tines that are bent during installation, similar to a staple or rivet. Typically made of thick wire with a half-circular cross section, split pins come in multiple sizes and types. The British definition of ""cotter pin"" is equivalent to U.S. term ""cotter"". To avoid confusion the term split cotter is sometimes used for a"
"Gudgeon A gudgeon is a socket-like, cylindrical (i.e., ""female"") fitting attached to one component to enable a pivoting or hinging connection to a second component. The second component carries a pintle fitting, the male counterpart to the gudgeon, enabling an interpivoting connection that can be easily separated. Designs that may use gudgeon and pintle connections include hinges, shutters and boat rudders. The ""gudgeon"" derives from the Middle English ""gojoun"", which originated from the Middle French ""goujon"". Its first known use was in the 15th century. A winged gudgeon is one that has extensions that increase its ability to adhere to"
"Pinwheel (cryptography) In cryptography, a pinwheel was a device for producing a short pseudorandom sequence of bits (determined by the machine's initial settings), as a component in a cipher machine. A pinwheel consisted of a rotating wheel with a certain number of positions on its periphery. Each position had a ""pin"", ""cam"" or ""lug"" which could be either ""set"" or ""unset"". As the wheel rotated, each of these pins would in turn affect other parts of the machine, producing a series of ""on"" or ""off"" pulses which would repeat after one full rotation of the wheel. If the machine contained"
"between structural components, typically in an effort to reduce sensitivity to earthquakes. The primary reason for using a hinge, rather than a simpler device such as a slide, is to prevent the separation of adjacent components. When no bending stresses are transmitted across the hinge it is called a ""zero moment hinge"". People have developed a variety of self-actuating, self-locking hinge designs for spacecraft deployable structures such as solar array panels, synthetic aperture radar antennas, booms, radiators, etc. Hinge A hinge is a mechanical bearing that connects two solid objects, typically allowing only a limited angle of rotation between them."
"Bit (key) The bit of a key is the part that actually engages the locking mechanism of a lock. (For example the tumblers in a pin tumbler lock.) The exact geometry of modern keys is usually described by a code system. This is referred to as the bitting. The bitting instructs a locksmith how to cut a certain key, to replace a lost key or make an additional copy. The bitting is usually a series of integers (e.g. 372164) that is usually translated from a key code chart or from a bitting code list to settings on specially designed key"
"of rectangular), produced by drilling axially into the assembled hub and shaft, with a metal dowel pin serving as the key. If the hole and key are tapered, the key is referred to as a ""Dutch pin"", which is driven in and optionally finished by cutting or grinding flush with the end of the shaft. If a straight Dutch keyway hole is optionally tapped with a thread, then an ordinary screw serves as the threaded Dutch key. Spring pins are an alternative Dutch key component, instead of solid dowel pins. A spring pin is self-fastening and does not work loose"
"Pivot joint In animal anatomy, a pivot joint (trochoid joint, rotary joint, lateral ginglymus) is a type of synovial joint. In pivot joints, the axis of a convex articular surface is parallel with the longitudinal axis of the bone. According to one classification system, a pivot joint like the other synovial joint —the hinge joint has one degree of freedom. Note that the degrees of freedom of a joint is not the same as the same as joint's range of motion. Pivot joints allow for rotation, which can be external (for example when rotating an arm outward), or internal (as"
"Hinged expansion joint A hinged expansion joint is a metallic assembly, that can rotate in a single plane, used to absorb changes resulting from piping thermal expansion or contraction. They include hinges, attached to the expansion joint ends with a pair of pins, which allow angular movement in a single plane, restrain the pressure thrust, and prevent the expansion joint from deflecting axially, either in extension or compression. It is recommended that the hinges should be used in sets of two or three. The expansion joint hinges provide for angular movement and will resist pressure thrust forces. Individual hinged expansion"
"Circlip A circlip (a portmanteau of ""circle"" and ""clip""), also known as a C-clip, Seeger ring, snap ring or Jesus clip, is a type of fastener or retaining ring consisting of a semi-flexible metal ring with open ends which can be snapped into place, into a machined groove on a dowel pin or other part to permit rotation but to prevent lateral movement. There are two basic types: internal and external, referring to whether they are fitted into a bore or over a shaft. Circlips are often used to secure pinned connections. When used to retain piston wrist pins or"
"Biologists Robert A. Laird and Thomas N. Sherratt have questioned both the truth of the story and the utility of the metaphor, pointing out that evolution of multicomponent systems need not result in identical component failure rates. Kingpin (automotive part) The kingpin, also king-pin and king pin, is the main pivot in the steering mechanism of a car or other vehicle. The term is also used to refer to part of a fifth wheel coupling apparatus. Originally, with the 'turntable' steering of horse-drawn wagons, this was a single pin on which the moveable axle was pivoted beneath the wagon's frame."
"Closing pin A closing pin is a curved piece of stainless steel metal used in the sport of skydiving. The pin is sewn onto the bridle which is a 7 to 10-foot long piece of nylon webbing connected to the pilot chute. The closing pin passes through the closing loop and in doing so, secures the main container of a skydiving rig, keeping the parachute from deploying prematurely. When the pilot chute is thrown out by the skydiver and catches air, it pulls the closing pin from the closing loop and allows the main parachute to be released from the"
"Plastic hinge In the structural engineering beam theory term, plastic hinge, is used to describe the deformation of a section of a beam where plastic bending occurs. In earthquake engineering plastic hinge is also a type of energy damping device allowing plastic rotation [deformation] of an otherwise rigid column connection. In plastic limit analysis of structural members subjected to bending, it is assumed that an abrupt transition from elastic to ideally plastic behaviour occurs at a certain value of moment, known as plastic moment (M). Member behaviour between M and M is considered to be elastic. When M is reached,"